ext/libelf/elf_cntl.c

   1 /*-
   2  * Copyright (c) 2006 Joseph Koshy
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27
  28 #include "libelf.h"
  29
  30 #include "_libelf.h"
  31
  32 int
  33 elf_cntl(Elf *e, Elf_Cmd c)
  34 {
  35         if (e == NULL ||
  36             (c != ELF_C_FDDONE && c != ELF_C_FDREAD)) {
  37                 LIBELF_SET_ERROR(ARGUMENT, 0);
  38                 return (-1);
  39         }
  40
  41         if (e->e_parent) {
  42                 LIBELF_SET_ERROR(ARCHIVE, 0);
  43                 return (-1);
  44         }
  45
  46         if (c == ELF_C_FDREAD) {
  47                 if (e->e_cmd == ELF_C_WRITE) {
  48                         LIBELF_SET_ERROR(MODE, 0);
  49                         return (-1);
  50                 }
  51                 else
  52                         return (0);
  53         }
  54
  55         e->e_fd = -1;
  56         return 0;
  57 }